{"id":"CVE-2026-87521","title":"Information leak in WebMCP in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to obtain cross-origin data via a crafted HTML page","summary":"Information leak in WebMCP in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)","severity":"low","cvss":3.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N","cwe":["CWE-200"],"vendor":"google","product":"chrome","affected":["chrome < 153.0.8010.36"],"patched":["chrome 153.0.8010.36"],"published":"2026-09-09","updated":"2026-09-09","sourceUpdated":"2026-09-09T18:02:53.943","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-87521","references":[{"url":"https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html","label":"chrome-cve-admin@google.com"},{"url":"https://issues.chromium.org/issues/512986143","label":"chrome-cve-admin@google.com"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87521.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-87521"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-87521"}],"tags":["nvd","cve.org","csaf","vex","red-hat","score-dispute"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-09-09T15:07:38.627768Z"},"epss":0.0023,"epssPercentile":0.12384,"scores":{"nvd":3.1,"adp":3.1,"vendor":5.7},"ingestedAt":"2026-09-09T01:17:17.509Z","slug":"CVE-2026-87521","body":"## Overview\n\nInformation leak in WebMCP in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to obtain cross-origin data via a crafted HTML page. (Chromium security severity: Medium)\n\n## Affected\n\n- `chrome < 153.0.8010.36`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `chrome 153.0.8010.36`\n\n## Vendor advisories\n\n- **Red Hat VEX** · updated 2026-09-09 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-87521.json)","depth":"sunlit","depthScore":17,"depthScoreParts":{"impact":17.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":202352,"id":"CVE-2026-87521","ts":1789400066826,"field":"cvss","old":null,"new":"3.1"},{"seq":202351,"id":"CVE-2026-87521","ts":1789400066826,"field":"severity","old":"none","new":"low"},{"seq":201079,"id":"CVE-2026-87521","ts":1789397619792,"field":"cvss","old":"3.1","new":null},{"seq":201078,"id":"CVE-2026-87521","ts":1789397619792,"field":"severity","old":"low","new":"none"},{"seq":199772,"id":"CVE-2026-87521","ts":1789395574008,"field":"cvss","old":null,"new":"3.1"},{"seq":199771,"id":"CVE-2026-87521","ts":1789395574008,"field":"severity","old":"none","new":"low"},{"seq":199013,"id":"CVE-2026-87521","ts":1789392259933,"field":"cvss","old":"3.1","new":null},{"seq":199012,"id":"CVE-2026-87521","ts":1789392259933,"field":"severity","old":"low","new":"none"},{"seq":197346,"id":"CVE-2026-87521","ts":1789384296475,"field":"cvss","old":null,"new":"3.1"},{"seq":197345,"id":"CVE-2026-87521","ts":1789384296475,"field":"severity","old":"none","new":"low"},{"seq":196620,"id":"CVE-2026-87521","ts":1789383765726,"field":"cvss","old":"3.1","new":null},{"seq":196619,"id":"CVE-2026-87521","ts":1789383765726,"field":"severity","old":"low","new":"none"},{"seq":195524,"id":"CVE-2026-87521","ts":1789380577341,"field":"cvss","old":null,"new":"3.1"},{"seq":195523,"id":"CVE-2026-87521","ts":1789380577341,"field":"severity","old":"none","new":"low"},{"seq":194475,"id":"CVE-2026-87521","ts":1789378789072,"field":"cvss","old":"3.1","new":null},{"seq":194474,"id":"CVE-2026-87521","ts":1789378789072,"field":"severity","old":"low","new":"none"},{"seq":193262,"id":"CVE-2026-87521","ts":1789376520475,"field":"cvss","old":null,"new":"3.1"},{"seq":193261,"id":"CVE-2026-87521","ts":1789376520475,"field":"severity","old":"none","new":"low"},{"seq":192049,"id":"CVE-2026-87521","ts":1789373638840,"field":"cvss","old":"3.1","new":null},{"seq":192048,"id":"CVE-2026-87521","ts":1789373638840,"field":"severity","old":"low","new":"none"},{"seq":190834,"id":"CVE-2026-87521","ts":1789369487318,"field":"cvss","old":null,"new":"3.1"},{"seq":190833,"id":"CVE-2026-87521","ts":1789369487318,"field":"severity","old":"none","new":"low"},{"seq":189621,"id":"CVE-2026-87521","ts":1789368460425,"field":"cvss","old":"3.1","new":null},{"seq":189620,"id":"CVE-2026-87521","ts":1789368460425,"field":"severity","old":"low","new":"none"},{"seq":188404,"id":"CVE-2026-87521","ts":1789365236415,"field":"cvss","old":null,"new":"3.1"},{"seq":188403,"id":"CVE-2026-87521","ts":1789365236415,"field":"severity","old":"none","new":"low"},{"seq":187191,"id":"CVE-2026-87521","ts":1789363479796,"field":"cvss","old":"3.1","new":null},{"seq":187190,"id":"CVE-2026-87521","ts":1789363479796,"field":"severity","old":"low","new":"none"},{"seq":185977,"id":"CVE-2026-87521","ts":1789361235046,"field":"cvss","old":null,"new":"3.1"},{"seq":185976,"id":"CVE-2026-87521","ts":1789361235046,"field":"severity","old":"none","new":"low"},{"seq":184764,"id":"CVE-2026-87521","ts":1789358376759,"field":"cvss","old":"3.1","new":null},{"seq":184763,"id":"CVE-2026-87521","ts":1789358376759,"field":"severity","old":"low","new":"none"},{"seq":183013,"id":"CVE-2026-87521","ts":1789354322878,"field":"cvss","old":null,"new":"3.1"},{"seq":183012,"id":"CVE-2026-87521","ts":1789354322878,"field":"severity","old":"none","new":"low"},{"seq":181806,"id":"CVE-2026-87521","ts":1789353334772,"field":"cvss","old":"3.1","new":null},{"seq":181805,"id":"CVE-2026-87521","ts":1789353334772,"field":"severity","old":"low","new":"none"},{"seq":180599,"id":"CVE-2026-87521","ts":1789350290388,"field":"cvss","old":null,"new":"3.1"},{"seq":180598,"id":"CVE-2026-87521","ts":1789350290388,"field":"severity","old":"none","new":"low"},{"seq":179392,"id":"CVE-2026-87521","ts":1789348308068,"field":"cvss","old":"3.1","new":null},{"seq":179391,"id":"CVE-2026-87521","ts":1789348308068,"field":"severity","old":"low","new":"none"},{"seq":178185,"id":"CVE-2026-87521","ts":1789346377422,"field":"cvss","old":null,"new":"3.1"},{"seq":178184,"id":"CVE-2026-87521","ts":1789346377422,"field":"severity","old":"none","new":"low"},{"seq":176978,"id":"CVE-2026-87521","ts":1789343187986,"field":"cvss","old":"3.1","new":null},{"seq":176977,"id":"CVE-2026-87521","ts":1789343187986,"field":"severity","old":"low","new":"none"},{"seq":175095,"id":"CVE-2026-87521","ts":1789334884028,"field":"cvss","old":null,"new":"3.1"},{"seq":175094,"id":"CVE-2026-87521","ts":1789334884028,"field":"severity","old":"none","new":"low"},{"seq":173890,"id":"CVE-2026-87521","ts":1789333703184,"field":"cvss","old":"3.1","new":null},{"seq":173889,"id":"CVE-2026-87521","ts":1789333703184,"field":"severity","old":"low","new":"none"},{"seq":172704,"id":"CVE-2026-87521","ts":1789331096416,"field":"cvss","old":null,"new":"3.1"},{"seq":172703,"id":"CVE-2026-87521","ts":1789331096416,"field":"severity","old":"none","new":"low"}]}